Remove npmignore

Whitelist files rather than dealing with npmignore override of
gitignore.

Package now includes src, lib, dist, and TS typings. (package.json,
readme, changelog, license are included automatically by npm)

Things no longer included in package: regression, test, examples, docs

Author: jasonkarns

.npmignore

@@ -9,6 +9,12 @@
     "url": "http://testdouble.com"
   },
   "main": "lib/index.js",
+  "files": [
+    "src",
+    "lib",
+    "dist",
+    "index.d.ts"
+  ],
   "config": {
     "build_file": "dist/testdouble.js",
     "test_bundle": "generated/tests.js",
@@ -18,7 +24,7 @@
     "clean": "rm -rf generated dist lib coverage",
     "postclean": "mkdir -p generated dist",
     "compile:browser": "browserify src/index.js --standalone td --outfile $npm_package_config_build_file -p headerify -t babelify",
-    "compile:browser:test": "mkdir -p generated && browserify regression/browser-helper.js --outfile $npm_package_config_test_bundle -t babelify -t coffeeify --extension=\".coffee\" -t require-globify --ignore-missing",
+    "compile:browser:test": "browserify regression/browser-helper.js --outfile $npm_package_config_test_bundle -t babelify -t coffeeify --extension=\".coffee\" -t require-globify --ignore-missing",
     "compile:node": "babel src -d lib",
     "compile": "yarn compile:node && yarn compile:browser && yarn compile:browser:test",
     "cover": "nyc --reporter=lcov --reporter=text-summary --require babel-core/register _mocha --ui mocha-given --reporter $npm_package_config_mocha_reporter --compilers coffee:coffee-script --recursive regression/node-helper.coffee regression/src",